Matlab - Shortest Distance

I have just started to use matlab and I am trying to find the shortest distance from a point P=(8,20) to a plane: v(a,b) = [6,0,0] + a[-2,1-0] + b[-1,0,1]
So far all I have done is to find the normal vector.
I know how to do this normally just unsure in matlab - any help would be great.

I have just started to use matlab and I am trying to find the shortest distance from a point P=(8,20) to a plane: v(a,b) = [6,0,0] + a[-2,1-0] + b[-1,0,1]
So far all I have done is to find the normal vector.
I know how to do this normally just unsure in matlab - any help would be great.